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Commit cf0cfe53 authored by Karsten Graul's avatar Karsten Graul Committed by David S. Miller
Browse files

net/smc: reduce amount of status updates to peer 



In smc_cdc_msg_recv_action() the received cdc message is evaluated.
To reduce the number of messaged triggered by this evaluation the logic
is streamlined. For the write_blocked condition we do not need to send
a response immediately. The remaining conditions can be put together
into one if clause.

Signed-off-by: default avatarKarsten Graul <kgraul@linux.ibm.com>
Signed-off-by: default avatarUrsula Braun <ubraun@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 16297d14

net/smc/smc_cdc.c

+8 −14
Original line number Diff line number Diff line
@@ -273,24 +273,18 @@ static void smc_cdc_msg_recv_action(struct smc_sock *smc, 
		smp_mb__after_atomic();

		smc->sk.sk_data_ready(&smc->sk);

	} else {

		if (conn->local_rx_ctrl.prod_flags.write_blocked ||

		    conn->local_rx_ctrl.prod_flags.cons_curs_upd_req ||

		    conn->local_rx_ctrl.prod_flags.urg_data_pending) {

		if (conn->local_rx_ctrl.prod_flags.write_blocked)

			smc->sk.sk_data_ready(&smc->sk);

		if (conn->local_rx_ctrl.prod_flags.urg_data_pending)

			conn->urg_state = SMC_URG_NOTYET;

			/* force immediate tx of current consumer cursor, but

			 * under send_lock to guarantee arrival in seqno-order

			 */

			if (smc->sk.sk_state != SMC_INIT)

				smc_tx_sndbuf_nonempty(conn);

		}

	}



	/* piggy backed tx info */

	/* trigger sndbuf consumer: RDMA write into peer RMBE and CDC */

	if (diff_cons && smc_tx_prepared_sends(conn)) {

	if ((diff_cons && smc_tx_prepared_sends(conn)) ||

	    conn->local_rx_ctrl.prod_flags.cons_curs_upd_req ||

	    conn->local_rx_ctrl.prod_flags.urg_data_pending)

		smc_tx_sndbuf_nonempty(conn);

	}



	if (diff_cons && conn->urg_tx_pend &&

	    atomic_read(&conn->peer_rmbe_space) == conn->peer_rmbe_size) {

		/* urg data confirmed by peer, indicate we're ready for more */